The knee is a sturdy joint, but it can dislocate as a result of injury. When this happens, there's a risk of injury to the nerves around the knee. Two nerves that may be injured are the peroneal and tibial nerves. The peroneal nerve has two main parts: one is close to the skin and the other deep in the muscles. Together, they are all called peripheral nerves. Each nerve has two jobs. It receives and sends information about sensation. This is the sensory component of the nerve. It also controls the movement of the leg by giving the muscle messages to contract. This is the motor component. The force of a knee dislocation may be enough to stretch or disrupt nearby nerves. This can result in pain, numbness, loss of motion, and a condition called foot drop. Nerve damage to the muscles that hold or pull the foot up is a cause of foot drop. If a nerve isn't completely destroyed, it can grow back. Nerves regrow at a rate of one millimeter each day or three centimeters each month (about one-half ...
Complex regional pain syndrome (CRPS) is a mystery. Every year 15,000 people in the United States are affected. After trauma of some kind to the arm or leg, pain and other symptoms persist long after healing has taken place. There are many theories to explain what went wrong but no known causes. In this study scientists find evidence to support the idea of nerve damage as a possible mechanism. Skin biopsies were taken from 18 adults with CRPS-I. CRPS-I is one of two types of CRPS. In this type patients don't have a known nerve injury. Skin biopsy is a sensitive test of small nerve fiber damage. Researchers counted the number of neurites (nerve endings). The loss of neurites may cause pain by triggering an overresponse on the part of the rest of the neurons still left. Seven control subjects were also biopsied. The control group had similar symptoms from traumatic injury or knee osteoarthritis but they didn't have CRPS. The scientists wanted to see if neurite losses occur with trauma of ...
Neuropathy - distal median nerve
Pain in the wrist or hand that wakes you up at night
May be severe Pain may be felt in other areas, for example in the upper arm (this is called referred pain)
Sensation changes in the thumb and pointer (index), middle, and part of the ring fingers, such as:
Weakness of the hand that causes you to:
Drop things Have difficulty grasping objects
Signs and tests
Your doctor will examine your wrist and ask questions about your medical history. The examination may show decreased sensation in the thumb side of the hand. This is called the "radial" side. There may be weakness of the thumb and difficulty using it to pinch.
Tests that reveal distal median nerve dysfunction may include:
Nerve conduction tests
Tests are ...
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